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Tennis Serve

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Words 1203
Pages 5
Article Summary 2
Catherine White

Wong, Francis Kh, Jackie Hk Keung, Newman Ml Lau, Douglas Ks Ng, Joanne Wy Chung, and Daniel Hk Chow. "Effects of Body Mass Index and Full Body Kinematics on Tennis Serve Speed." Journal of Human Kinetics 40 (2014): 21-28. SPORTDiscuss with Full Text. Web. 30 Oct. 2015.
Purpose
One of the most important shots in tennis is the serve. The importance of the serve lies in its accuracy and speed which directly relates to the outcome of winning tennis matches. This is one of the most difficult strokes in the game to master because it requires the use, and coordination of the trunk, upper and lower extremities all in a kinetic chain movement. Because it is reported as such a hard shot to hit, this study was done …show more content…
There have been many studies to try to find the best way to hit the serve, but this study focuses on the anthropometric factors of the body and the body’s kinematics effect on the speed of the and to improve the training of athlete’s serves. (Wong, Keung, Lau, Chung, Chow, 2014)

Methods
The author used twelve male elite tennis players with major match play experience from the Hong Kong national tennis team. The players had a mean age of 20.5, 8.3 average years of training and 36.9 average hours of training per month. The BMI was determined by the formula of the player’s body mass divided by the square of his body height. (Wong, et, al. 2014 p. 22) In order to find the body and racket kinematics of the serves, the movements were recorded by an 8-camera motion analysis system. The ball speed was measured by a radar speed gun in kilometers per hour that was placed on the baseline of the tennis court. To find the kinematics themselves, 43 “retro-reflective” markers were placed on the participant and the racket to measure body kinematics and the moment of ball to racket …show more content…
The half of the group that had a serve under 150 km/h had a mean BMI of 20.45 kg/m2, which was significantly smaller than the 23.87 kg/m2 average BMI of the other half of subjects with a serve speed of over 150 km/h. (Wong et al. 2014 p. 23) In the other half of the study, the kinematic analysis, it was found that the speed of the ball was significantly and positively correlated with racket-side knee range of motion during phase 2 and 3, racket side knee peak extension velocity during phase 2, racket side shoulder range of motion during phase 3 and racket side elbow peak extension velocity during phase 3. (Wong et al. 2014 p. 23) This can be seen in table two, on page 24 of the

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